How to best create an abstract class for generic modelmapper management? To convert Entity and Dto for Spring REST API Application

Question

I want to create an abstract class to be able to convert entities into dto and dto into entities with the modelmapper library. What am I doing wrong?

public abstract class AbstractConverter<Entity,DTO> {

    @Autowired
    ModelMapper modelMapper;

    public Entity toEntity(DTO dto) {
        return modelMapper.map(dto, Entity.class);
    }

}

This is the error

Illegal class literal for the type parameter Entity

In this case Entity is a generic object that is passed as a parameter — Luca De Salve, Sep 28 '21 at 12:03

score 1 · Answer 1 · answered Sep 28 '21 at 12:11

1

The method signature must be

public <Entity, DTO> Entity toEntity(DTO dto) {
    return modelMapper.map(dto, Entity.class);
}

answered Sep 28 '21 at 12:11

Simon Martinelli

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The type Entity is not generic; it cannot be parameterized with arguments – Luca De Salve Sep 28 '21 at 12:23
So Entity and DTO are classes, right? Then why do you have generic types on your class definition? – Simon Martinelli Sep 28 '21 at 12:25
Entity and Dto are not classes, but generic classes. Specific classes are injected when AbastracConverter is inherited – Luca De Salve Sep 28 '21 at 13:17
Can you post the code of Entity? – Simon Martinelli Sep 28 '21 at 14:33
I opened a new question with the complete code https://stackoverflow.com/questions/69364258/what-is-the-best-way-to-convert-entity-to-dto-for-spring-rest-api-application – Luca De Salve Sep 28 '21 at 15:09

How to best create an abstract class for generic modelmapper management? To convert Entity and Dto for Spring REST API Application

1 Answers1